Land Surveyor Forum

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  • Land Surveyor
    DEWARD BOWLES April 24, 2014 at 1:24pm
    Thanks Paul!
  • Paul Quagge April 21, 2014 at 8:09pm

    Hello Mat,

    In a simple format:

    Your measuring in 3 dimensions on the face of the earth,an oblate sphere, using GPS.

    Earth Centered Earth fixed on an oblate spheroid.

    You want to turn your 3D measurements into 2D measurements but it is not a 1 to 1 conversion.

    The map projections in the attached articles allow you to come close giving you scaling factors within a certain distance or zone. Within most of the zone you are less than,at two places you are 1:1, and for a very small amount you are greater than.

    You are reducing your ground distance on a 3D object down to a flat piece of paper.

    Please see attached articles, hope this gets you started....would suggest that you study geodesy.

    http://www.ngs.noaa.gov/TOOLS/spc.shtml

    Good Luck, Paul

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